From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 24B0AC7EE29 for ; Thu, 8 Jun 2023 17:58:42 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1q7JtK-0008UH-CE; Thu, 08 Jun 2023 13:57:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q7JtJ-0008Tk-7A for qemu-devel@nongnu.org; Thu, 08 Jun 2023 13:57:45 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q7JtH-0000dX-I5 for qemu-devel@nongnu.org; Thu, 08 Jun 2023 13:57:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1686247061; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type; bh=4mJL0p+dXYtHUNHX84VZGaRjD5xRWpy6/Fuia8VRXOk=; b=DEdsakNUtQDWn/R5zHarFUgP0kQsrpk47s8Gniiz5Rp/8Mhyt/t0xLsELKgIzw1bE/BpGV mvnJs2JeyUrxVA2W8DTVwz97k7gmslaEBcOhRH96jNFwMVObhOEbgwHu6ezNIInr0uyiqV jK3dJIc66lLKBxu5/I2/d8oa6WtKHp4= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-208-c-m8oDkwM76BAJomyXGwEA-1; Thu, 08 Jun 2023 13:57:39 -0400 X-MC-Unique: c-m8oDkwM76BAJomyXGwEA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 9DCD83C0C89F for ; Thu, 8 Jun 2023 17:57:39 +0000 (UTC) Received: from localhost (unknown [10.39.192.206]) by smtp.corp.redhat.com (Postfix) with ESMTP id 62C662026D49 for ; Thu, 8 Jun 2023 17:57:39 +0000 (UTC) Date: Thu, 8 Jun 2023 18:57:38 +0100 From: "Richard W.M. Jones" To: qemu-devel@nongnu.org Subject: Collecting information from a hung qemu process Message-ID: <20230608175738.GA32610@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Received-SPF: pass client-ip=170.10.133.124; envelope-from=rjones@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org I filed this bug about recent Linux hanging very rarely when booting on recent qemu: https://gitlab.com/qemu-project/qemu/-/issues/1696 As I'm able to reproduce this bug at will (albeit I have to wait for 100s or 1000s of iterations of the test), I am able to observe the qemu process after it hangs. Is there any information which is useful to collect from the hung qemu, such as stack traces, etc? I know how to collect a stack trace, but if there's other information please give me a guide about how to collect that. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW